A high-level API for quickly building and training neural networks.
Keras is an automatic car for neural networks. The gears shift themselves. You just steer and press the gas.
People use it in classes and quick tests. A few code lines get a model moving.
TensorFlow
Keras often uses TensorFlow as its backend.
Deep Learning
Keras makes deep learning easier to start.
Neural-network
Keras helps you build and train neural networks fast.
PyTorch
PyTorch is more flexible. Keras is quicker to learn.